摘要
In this study,a g-C_(3)N_(4)-Cu_(2)O-TiO_(2) photocatalyst with a novel three-dimensional ordered macroporous(3DOM)structure was successfully prepared using a sacrificial template strategy and a photodeposition method.The influence of the special porous structure with cross pore channels on the photocatalytic properties of the as-prepared sample was studied in detail.Compared with the original photocatalyst(TiO_(2) with 3 wt%Pt),g-C_(3)N_(4)-Cu_(2)O-TiO_(2) exhibited a higher specific surface area and more active sites,thus accelerating the separation efficiency of the photogenerated electron-hole pair.Consequently,the as-prepared photocatalyst showed good photocatalytic performance,reaching a maximum hydrogen production rate of 12,108μmol g^(-1) h^(-1) and approximately five times higher than that of the pristine comparison sample.The enhanced photoactivity of the g-C_(3)N_(4)-Cu_(2)O-TiO_(2) heterojunction can be ascribed to its double p-n heterojunction and robust porous structure,where the photodeposited Cu_(2)O plays a synergistic catalytic role in the photocatalytic process and the outer clad g-C_(3)N_(4) layer prevents Cu_(2)O oxidation.Additionally,the possible photocatalytic mechanism was briefly discussed based on the experimental results.This work identifies viable pathways for developing low-cost heterojunction photocatalysts with highly efficient photocatalytic activity toward improved solar energy conversion.
本文通过模板法与光沉积法成功制备了具有三维有序多孔结构的g-C_(3)N_(4)-Cu_(2)O-TiO_(2)光催化剂,并详细研究了特殊多孔结构对原制备样品光催化性能的影响.与原有的光催化剂相比,多孔结构的g-C_(3)N_(4)-Cu_(2)O-TiO_(2)具有更高的比表面积和更多的活性位点,从而加速了光生电子-空穴的分离效率.因而,该光催化剂表现出良好的光催化性能,最大产氢率可达12,108μmol g^(-1) h^(-1),是原始对比样品产氢率的5倍左右.g-C_(3)N_(4)-Cu_(2)O-TiO_(2)对于光催化性能的增强可归因于其双p-n异质结和稳健的多孔结构.光沉积Cu_(2)O在光催化过程中起协同催化作用,外层包覆的g-C3N4层保护Cu_(2)O以防止催化剂氧化.此外,本文探究了该催化剂的光催化机理.本工作为开发具有高效光催化活性的低成本异质结光催化剂开辟了新途径.
基金
funded by the National Key Research and Development Program of China (2016YFC0300200)
the National Natural Science Foundation of China (21975229)
the Natural Science Foundation of Zhejiang Province (Y19B060003)
